Red gems (6)
I believe the answer is:
rubies
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">red gems</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rubies that I've seen before include "The Stones in the red" , "Deep red gems" , "Deep red jewels" , "Red gemstones" .)